Automatic Operation - Daikin SUPER MULTI NX G Series Service Manual

SiUS12-928_A
1.6

Automatic Operation

Outline
Automatic Cooling / Heating Function
When the AUTO mode is selected with the remote controller, the microcomputer automatically
determines the operation mode as cooling or heating according to the room temperature and the
set temperature at start-up, and automatically operates in that mode.
The unit automatically switches the operation mode to maintain the room temperature at the set
temperature.
Details
1. The set temperature (Ts) determines the target temperature (Tt).
2. The target temperature (Tt) is calculated as;
3. Thermostat ON/OFF point and mode switching point are as follows.
4. During initial operation
Target temperature – 2.0˚C (– 3.6ºF)
= Thermostat OFF
Target temperature – 2.5˚C (– 4.5ºF)
Ex: When the target temperature is 25°C (77°F)
Function and Control
Ts: Set temperature (set by remote controller)
Tt: target temperature (determined by microcomputer)
Tr: room thermistor temperature (detected by room temperature thermistor)
C: correction value
(Ts = 18 ~ 30°C, 64 ~ 86°F).
Tt = Ts + C
where C is the correction value.
C = 0°C (0°F): Cooling operation
C = 2°C (3.6°F): Heating operation
Tr means the room thermistor temperature.
N Heating → Cooling switching point:
Tr ≥ Tt + 2.5°C (4.5°F)
O Cooling → Heating switching point:
Tr < Tt – 2.5°C (4.5°F)
P Thermostat ON/OFF point is the same as the ON/OFF point of cooling or heating operation.
Tr ≥ Ts : Cooling operation
Tr < Ts : Heating operation
Cooling → 23°C (73.4°F): Thermostat OFF → 22°C (72°F): Switch to heating
Heating → 26.5°C (79.7°F): Thermostat OFF → 27.5°C (81.5°F): Switch to cooling
Cooling Operation
Target temperature + 2.5˚C (4.5ºF)
Heating Operation
Main Functions
Target temperature + 1.5˚C (2.7ºF)
= Thermostat OFF
(R11722)
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